A map has a scale of 1 cm : 12 km. Two cities are 2.1 cm apart on the map. To the nearest tenth of a kilometer, what is the actual distance corresponding to the map distance?

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Let x represent the actual distance we are looking for.

We will construct the following proportion then use the cross multiplication method to solve.

`(1 cm)/(12km)=(2.1cm)/(x)=>`

`2.1*12=1*x=>25.2=x`

Hence the actual distance is 25.2 km.

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